Kittydoll is a doll possessed by a 10 year old kid named Lina. Lina is energetic, sometimes mean or aggressive to the other kids but has a sweet side aswell. The doll resembles her sister Katherine's physical look, so that's why Lina calls herself kittydoll now (kitty is short for Katherine). Lina is able to move the doll's body and when needed, she stays still with her mouth open to pretend she's an inanimate object.